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From:   Dmitry Osipenko <digetx@gmail.com>
To:     Thierry Reding <treding@nvidia.com>,
        Jonathan Hunter <jonathanh@nvidia.com>,
        Mark Brown <broonie@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Sebastian Reichel <sre@kernel.org>,
        Peter Chen <peter.chen@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Felipe Balbi <balbi@kernel.org>,
        David Heidelberg <david@ixit.cz>
Cc:     devicetree@vger.kernel.org, linux-pm@vger.kernel.org,
        linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-tegra@vger.kernel.org
Subject: [PATCH v2 12/12] ARM: tegra: nexus7: Enable USB OTG mode
Date:   Fri,  2 Jul 2021 02:43:17 +0300
Message-Id: <20210701234317.26393-13-digetx@gmail.com>
In-Reply-To: <20210701234317.26393-1-digetx@gmail.com>
References: <20210701234317.26393-1-digetx@gmail.com>
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Nexus 7 has OTG-cable microUSB port, enable OTG mode. USB peripheral
devices now can be connected to Nexus 7 using OTG adapter, switching
USB port into host mode.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 .../tegra30-asus-nexus7-grouper-common.dtsi   | 25 +++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/dts/tegra30-asus-nexus7-grouper-common.dtsi b/arch/arm/boot/dts/tegra30-asus-nexus7-grouper-common.dtsi
index 8bc552b09672..c341e8971b2f 100644
--- a/arch/arm/boot/dts/tegra30-asus-nexus7-grouper-common.dtsi
+++ b/arch/arm/boot/dts/tegra30-asus-nexus7-grouper-common.dtsi
@@ -941,9 +941,29 @@ power_supply: charger@6a {
 			interrupts = <TEGRA_GPIO(V, 1) IRQ_TYPE_EDGE_BOTH>;
 
 			summit,enable-charge-control = <SMB3XX_CHG_ENABLE_PIN_ACTIVE_LOW>;
+			summit,inok-polarity = <SMB3XX_SYSOK_INOK_ACTIVE_LOW>;
 			summit,enable-usb-charging;
 
 			monitored-battery = <&battery_cell>;
+
+			usb_vbus: usb-vbus {
+				regulator-name = "usb_vbus";
+				regulator-min-microvolt = <5000000>;
+				regulator-max-microvolt = <5000000>;
+				regulator-min-microamp = <750000>;
+				regulator-max-microamp = <750000>;
+
+				/*
+				 * SMB347 INOK input pin is connected to PMIC's
+				 * ACOK output, which is fixed to ACTIVE_LOW as
+				 * long as battery voltage is in a good range.
+				 *
+				 * Active INOK disables SMB347 output, so polarity
+				 * needs to be toggled when we want to get the
+				 * output.
+				 */
+				summit,needs-inok-toggle;
+			};
 		};
 	};
 
@@ -1017,12 +1037,13 @@ sdmmc4: mmc@78000600 {
 	usb@7d000000 {
 		compatible = "nvidia,tegra30-udc";
 		status = "okay";
-		dr_mode = "peripheral";
+		dr_mode = "otg";
+		vbus-supply = <&usb_vbus>;
 	};
 
 	usb-phy@7d000000 {
 		status = "okay";
-		dr_mode = "peripheral";
+		dr_mode = "otg";
 		nvidia,hssync-start-delay = <0>;
 		nvidia,xcvr-lsfslew = <2>;
 		nvidia,xcvr-lsrslew = <2>;
-- 
2.30.2